Raychem ETS-05 Electronic Thermostat

Description

The Raychem ETS-05 electronic surface sensing thermostat provides accurate temperature control for heating cables. The ETS-05 is available in two versions: ETS-05-L for temperatures up to 199°C (390°F) and ETS-05-H for temperatures up to 499°C (930°F). Both thermostats have a maximum nominal load of 24 A. Temperature setting is accurate via digital rotary switches inside the enclosure. The ETS-05 features an LED indicator for thermostat status (powered on/off), heat-tracing cable status (powered on/off), and sensor status. In case of sensor failure, the thermostat can switch to an on or off state, depending on user requirements.

Approvals

FM Approvals: CL I, ZN 1 AEx e ia mb IIC T5 Gb; Zone 21 AEx tb IIIC T100°C; Ex e ia mb IIC T5 Gb; Ex tb IIIC T100°C Db; CL I, DIV 2, Groups B, C, D; CL II, DIV 2, Groups E, F, G; CL III; TYPE 4X/IP66.

Maximum Service Temperature: 125°C (257°F)
Minimum Service Temperature: -40°C (-40°F)
Ambient Temperature Range: -40°C to 60°C (-40°F to 140°F)

ETS-05 Thermostat Contents

Available Versions

Tools Required

• Terminal Screwdriver
• Flat Screwdriver
• Trimming Knife

Materials Required

• Certified glands suitable for use with the thermostat enclosure

Warnings

This component must be installed correctly to ensure proper operation and to prevent shock or fire. Read these important warnings and carefully follow all of the installation instructions.

• To minimize the danger of fire from sustained electrical arcing if the heating cable is damaged or improperly installed, and to comply with the requirements of Chemelex, agency certifications, and the National Electrical Code, ground-fault equipment protection must be used. Arcing may not be stopped by conventional circuit breakers.
• Component approvals and performance are based on the use of Chemelex-specified parts only. Do not use substitute parts or vinyl electrical tape.
• The black heating cable core and fibers are conductive and can short. They must be properly insulated and kept dry.
• Damaged bus wires can overheat or short. Do not break bus wire strands when scoring the jacket or core.
• Keep components and heating cable ends dry before and during installation.
• Use only fire resistant insulation materials, such as fiberglass wrap or flame-retardant foam.

Terminal Block and Sensor/Failure Mode Select Terminals

Terminal Block:

1: Relay Out
2: Neutral Out
3: Neutral Supply
4: Line Supply
5, 6, 7: Earth

Terminals 2 and 3 are joined electrically. Terminals 5, 6 and 7 are joined electrically.

NOTE: Do not remove Earth connecting wire.

Sensor/Failure Mode Select Terminals:

Terminals 1 to 3 allow for the connection of a three-wire PT100 sensor.

Terminals 3 to 4 allow the user to select the default heating status on sensor error:

• Without a link fitted (Link 3-4 removed): Output OFF if a sensor error is detected.
• With a link fitted (Link 3-4 fitted): Output ON if a sensor error is detected (default).

Enclosure Installation Raychem ETS-05 Thermostat

(For Pipe Stand Installation please refer to H59250)

• The heating cable can be directly terminated to the thermostat without an intermediate junction box using the Raychem C75-100-A or HAK-C-100 connection kits. Only the unheated section of the heater (cold lead) may protrude into the thermostat enclosure.
• Alternative mounting arrangements are illustrated (4 mounting holes, 17/64" dia (M6) clearance at 4.2" x 3.2" (106 x 82 mm)).
• For optimized temperature control, install the unit remote from the sensor bulb. Locate the enclosure at an appropriate place to avoid exposure to mechanical and thermal damage (do not mount on pipe for high temperatures).

WARNING: When working in damp or wet conditions, protect the thermostat contents from water ingress by closing the lid when not working on the assembly.

Location of the sensor Raychem ETS-05 (when equipped)

As indicated in the system design documentation.

• Away from valves, flanges, supports, pumps, or other heat sinks.
• At the top of the pipe for thermally sensitive pipe contents (A).
• On the lower quadrant of the pipe 90° for a single heating cable (B).
• On the lower quadrant of the pipe centrally between the heating cables if there are two or more (C).

Diagram showing sensor placement options (A, B, C) on a pipe.

Attachment of the sensor Raychem ETS-05

• Fix sensor firmly on the surface with adequate fixing tape in two places (D).
• Fix sensor parallel to the pipe (D).
• Route the extension cable to avoid damage in use. Fix to the pipe with adequate tape where appropriate.

WARNING: Do not install the sensor at ambient temperatures below -4°F (-20°C). Do not bend the sensor (last 2 in / 50 mm); keep it straight under all circumstances. Minimum bending radius for High Temperature Mineral Insulated Sensor extension cable: 6x diameter.

Typical Wiring Diagram for Direct Switching

Diagram illustrating the wiring for direct switching, showing connections for L1, N, PE, ETS-05 terminals, and fail-safe option.

* Circuit breaker configurations may vary according to local standards/requirements.

Complete Installation Raychem ETS-05

• Ensure that the pipe and sensor are thermally insulated and clad to the design specification after installation of the thermostat. Seal cladding with sealant (A).
• When thermostat installation is complete, test as described in the Testing & Commissioning Section. Retain this instruction for future use, e.g. setting, testing, maintenance etc.

Setting

If necessary, loosen lid screws and remove lid. Adjust digital switches to switching temperature (°C). Locate lid and tighten lid screws.

WARNING: Ensure thermostat is isolated elsewhere for a minimum of 1 minute before opening.

Note: Temperature setpoint is in °C. To convert °F to °C use the formula (°F - 32) x 0.56.

Diagrams showing the digital switches for ETS-05-Lx and ETS-05-Hx.

Testing, Commissioning, and Maintenance

Test heating cable when thermostat installation is complete as directed in Raychem Installation and Maintenance manual. Maintain thermostat during normal plant maintenance.

CHECK:

• Mounting is firm.
• Exposed extension cable is not damaged.
• Gland sealing washer is in place.
• Gland seal (grommet) is in place.
• Gland body and nut(s) are tightened firmly.
• Thermostat operation is correct.
• Thermostat setting suits application.
• Lid is closed firmly.
• Cable type is correct (Insulation > 277 V and temperature rating to suit application) - Note: Cable gland heatrise could reach 30K.
• Not more than one conductor may be connected into power terminal block without the use of a single insulated bootlace ferrule.

Contact Information